Simply, a bag filled with loot. Typically, a small bag of any sort is filled with a fair number of small things. For children, typically cheap toys and/or small candies. Also known as a "goodie bag".
Shopping bags are medium-sized bags, typically around 10–20 litres (2.5–5 gallons) in volume (though much larger versions exist, especially for non-grocery shopping), that are used by shoppers to carry home their purchases.
